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This also moves processing of the KeyEvent JSON structure into
ui/keyboard/ from chrome/browser/extensions/api/input/input.cc.

The JS is setup with a separate implementation of send_key_event.js
(send_key_event_webui.js) that is mapped to the send_key_event.js
resource by the WebUIController.  This allows the WebUI and extension
code to be entirely shared.

BUG=222801

Review URL: https://chromiumcodereview.appspot.com/14161009

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@195218 0039d316-1c4b-4281-b951-d872f2087c98